[MPlayer-users] PSNR Questions
Ian
the.pond at dsl.pipex.com
Sat Feb 15 18:32:04 CET 2003
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D Richard Felker III wrote:
> Huh?? This is nonsense. You can't compare PSNR relative to two
> different reference 'signals'. When encoding, the source is considered
> the signal, and the difference between the encoded picture and the
> source is the noise, so the source has infinite PSNR automatically.
OK, this is the first time I've seen it stated, a formula would be nice
too, but in any case see below . . .
> Yes, theoretically. Computational issues might make it come out
> different tho.
Regardless, since in my experience better quality material (ie. the
originals!) has a lower PSNR than the copies, I can't take it seriously.
Obviously your experience is different.
> Huh?? Do you even know what PSNR means??
Can't find the reference (it seems to be unavailable ATM), but I thought
it was peak signal to noise ratio. I can't be that much of a dimwit if
I'm using the encoder successfully, now can I? ;)
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Ian Smith
Worst . . . signature . . . ever !
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